Polyesters

摘要

Cyclic oligomer fractions of ethylene terephthalate c(ET)_n and 1,4-cyclohexylenedimethylene terephthalate c(CT)_n were obtained by cyclodepolymerisation of their respective polyesters, the former containing around 80 mol% of trimer and the latter with around 70 mol% of trimer to pentamer. Mixtures of these fractions at selected compositions were subjected to ring opening copolymerisation, to give a series of poly(ethylene-co-cyclohexylenedimethylene terephthalate) copolyesters with ethylene terephthalate /1,4-cyclohexylenedimethylene terephthalate comonomer ratios ranging from 90/10 to 10/90.